249920641 has 4 divisors (see below), whose sum is σ = 249994800. Its totient is φ = 249846484.

The previous prime is 249920609. The next prime is 249920651. The reversal of 249920641 is 146029942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146029942 = 2 ⋅73014971.

It is a cyclic number.

It is not a de Polignac number, because 249920641 - 2⁵ = 249920609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249920641.

It is not an unprimeable number, because it can be changed into a prime (249920651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31771 + ... + 38848.

It is an arithmetic number, because the mean of its divisors is an integer number (62498700).

Almost surely, 2^249920641 is an apocalyptic number.

It is an amenable number.

249920641 is a deficient number, since it is larger than the sum of its proper divisors (74159).

249920641 is an equidigital number, since it uses as much as digits as its factorization.

249920641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74158.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 249920641 is about 15808.8785497264. The cubic root of 249920641 is about 629.8938605100.

The spelling of 249920641 in words is "two hundred forty-nine million, nine hundred twenty thousand, six hundred forty-one".